Converting a char array to a IPv6 address in C#?

Question

I have numbers stored in a SQL Server char(39) field that I need to convert to a IPv6 IPAddress?

Examples

281470698521600
281470698522623
58569107296622255421594597096899477504 
58569107375850417935858934690443427839

I don't know much about IPv6 but I'm assuming I can ping the address to verify it is correct. I could do with some help converting it from a number though? The examples seem short, are they missing subnetting?

I've converted bigint to IPv4 addresses using IPAddress ip = new IPAddress(convertedNumber); after check BitConverter.IsLittleEndian. I'm currently reading up on how IPv6 works. — Slothie
– Slothie, Commented Mar 21, 2021 at 2:50

Joel Coehoorn · Accepted Answer · 2021-03-21 02:45:30Z

1

The number has to be made into a hex string (12 characters) and then separate the character into groups of 2 characters with a colon between each group. Here is sample code

string input = "281470698521600";
string hex = long.Parse(input).ToString("x");
string[] array = hex.ToCharArray()
    .Select((x, i) => new { chr = x, index = i })
    .GroupBy(x => x.index / 2)
    .Select(x => x.First().chr.ToString() + x.Last().chr.ToString())
    .ToArray();
string IPV6 = string.Join(":", array);

The output would be this : ff:ff:01:00:04:00

edited Mar 21, 2021 at 2:45

Joel Coehoorn

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answered Mar 20, 2021 at 23:35

jdweng

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